Are 2 senses better than 1 ?

For my Science Fair project I will be looking into the Rates of Reactions and if using 1 of the senses is better than using 1. For example, I'd be using a ruler and seeing how quick it takes a person to grab that ruler using either the sense of sight, hearing or both of them combined. I hope to solve which sense is stronger. Will they be better off on their own, or together ?